fe6aa6ae clang-tidy: fix `bugprone-unused-local-non-trivial-variable` lints
725e30b2 clang-tidy: fix `readability-container-size-empty` lints
b74a3121 clang-tidy: fix `readability-redundant-member-init` lints
3be8fa8f clang-tidy: fix `readability-avoid-return-with-void-value` lints
4ac38f30 clang-tidy: fix `readability-redundant-casting` lints
3bc5a648 clang-tidy: fix `readability-redundant-inline-specifier` lints

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Ryan Krattiger <ryan.krattiger@kitware.com>
Merge-request: !11893